US9463782B2 - Brake control system - Google Patents
Brake control system Download PDFInfo
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- US9463782B2 US9463782B2 US14/605,116 US201514605116A US9463782B2 US 9463782 B2 US9463782 B2 US 9463782B2 US 201514605116 A US201514605116 A US 201514605116A US 9463782 B2 US9463782 B2 US 9463782B2
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Images
Classifications
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- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/10—Dynamic electric regenerative braking
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/176—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS
- B60T8/1761—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS responsive to wheel or brake dynamics, e.g. wheel slip, wheel acceleration or rate of change of brake fluid pressure
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- B60L3/108—Indicating wheel slip ; Correction of wheel slip for maintaining or recovering the adhesion of the drive wheels whilst braking, i.e. ABS
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- B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
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- B60T13/142—Systems with master cylinder
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- B60T13/146—Part of the system directly actuated by booster pressure
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- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
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- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
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- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/745—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/18—Conjoint control of vehicle sub-units of different type or different function including control of braking systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2270/00—Further aspects of brake control systems not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
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- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
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- B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T10/7258—
Definitions
- the present invention relates to a brake control system which is used preferably on a vehicle such as a motor vehicle.
- a distribution between a frictional braking force produced by friction linings and a regenerative braking force produced by the motor is controlled to obtain a total braking force desired for the vehicle (refer to Japanese Patent Application Publication No. 2012-95391, for example).
- the invention has been made in view of the problem inherent in the related art, and an object of the invention is to provide a brake control system which can maintain the behavior of a vehicle stable when a slip occurs as a result of intervention of regenerative braking.
- a brake control system driven by an electric motor and configured to brake a vehicle by not only controlling an amount of regenerative braking by the electric motor but also controlling friction braking devices which are provided individually at wheels and which each have a friction, lining which moves upon receipt of a hydraulic pressure, including a slip amount detection, unit configured to detect an amount of slip of each of the wheels which are provided on the vehicle and a regenerative slip control unit configured to execute repeatedly a slip restricting control in which an amount of regenerative braking is reduced by a predetermined amount and thereafter, the resulting reduced amount of generative braking is held for a predetermined period of time while the wheels are being detected as slipping through a detection, value of the slip amount detection unit during a regenerative braking by the electric motor, wherein the slip restricting control unit sets the predetermined reduction amount by which the amount of regenerative braking is reduced when, the wheels are detected as slipping larger than a predetermined reduction, amount by which the amount of
- the behavior of the vehicle cars be maintained stable when a slip occurs as a result of the intervention, of regenerative braking.
- FIG. 1 is a conceptual diagram of a vehicle which installs a brake control system according to an embodiment of the invention.
- FIG. 2 is a block diagram showing an electric booster unit, a hydraulic pressure supply unit and the like which are shown in FIG. 1 .
- FIG. 3 is a flowchart showing a control process by the brake control system.
- FIG. 4 is a characteristic curve chart showing an example of a change with, time in drive wheel braking amount and drive wheel slip amount according to the embodiment.
- FIG. 5 is a characteristic curve chart showing another example of a change with time in drive wheel braking amount and drive wheel slip amount.
- FIG. 6 is a characteristic curve chart showing an example of a change with time in drive wheel braking amount and drive wheel slip amount according to a first modified example.
- FIG. 7 is a characteristic curve chart showing an example of a change with time in drive wheel braking amount and drive wheel slip amount according to a second modified example.
- FIGS. 1 to 5 show an embodiment of the invention.
- left and right front wheels 2 L, 2 R and left and right rear wheels 3 L, 3 R are provided on a lower side (a road surface side) of a body 1 which makes up a vehicle.
- Front wheel side wheel cylinders 4 L, 4 R are provided individually on the left and right front wheels 2 L, 2 R, and rear wheel side wheel cylinders 5 L, 5 R are provided individually on the left and right rear wheels 3 L, 3 R.
- wheel cylinders 4 L, 4 R, 5 L, 5 R constitute cylinders of hydraulic disc brakes or drum brakes and impart braking force to the corresponding wheels (the front wheels 2 L, 2 R and the rear wheels 3 L, 3 R).
- the wheel cylinders 4 L, 4 R, 5 L, 5 R make up friction brake units 6 (for example, disc brakes or drum brakes) together with frictional linings (friction pads or brake shoes) which move upon receipt of hydraulic pressure.
- the friction brake units 6 are provided individually on the wheels 2 L, 2 R, 3 L, 3 R to slow or stop the vehicle by the use of friction produced between the friction linings and rotational members (discs or drums) which rotate together with their corresponding wheels 2 L, 2 R, 3 L, 3 R when the friction linings are pressed against their corresponding rotational members.
- a brake pedal 7 is provided on a passenger compartment side of a bulkhead of the body 1 .
- a driving person depresses the brake pedal 7 in a direction indicated by an arrow W in FIGS. 1 and 2 when he or she attempts to slow or stop the vehicle.
- a brake switch 7 A and a depression amount detection sensor 8 are provided on the brake pedal 7 .
- the brake switch 7 A detects whether or not the brakes are applied to slow or stop the vehicle and turns on or off brake lamps (not shown).
- the depression amount detection sensor 8 detects a depression amount (a stroking amount) of or depressing force applied to the brake pedal 7 and outputs a detection signal to ECUs 27 , 35 , which will be described later, a vehicle data bus 29 and the like.
- a brake hydraulic pressure is produced in a master cylinder 9 via an electric booster unit 17 , which will be described later.
- the master cylinder 9 has a bottomed cylindrical cylinder main body 10 which is opened at one end and is closed at the other end by a bottom portion.
- First and second supply ports 10 A, 10 B are provided on this cylinder main body 10 , and these ports communicate with an interior of a reservoir 15 , which will, be described later.
- the first supply port 10 A is caused to communicate with or is cut off from a first hydraulic chamber 12 A by sliding displacements of a booster piston 19 , which will be described later.
- the second supply port 10 B is caused to communicate with or is cut off from a second hydraulic chamber 12 B by a second piston 11 , which will be described later.
- the cylinder main body 10 is secured detachably to a booster housing 18 of the electric booster unit 17 , which will be described later, at its open end with a plurality of attaching bolts (not shown).
- the master cylinder 9 includes the cylinder main body 10 , a first piston (the booster piston 19 and an input rod 20 , which will be described later) and the second piston 11 , the first hydraulic chamber 12 A, the second hydraulic chamber 12 B, a first return spring 13 and a second return spring.
- signal lines of an electric circuit are denoted by thin lines each provided with pairs of oblique lines scattered along the length thereof, and power supply lines of the electric circuit are denoted by thick lines each provided with pairs of oblique lines scattered along the length thereof.
- hydraulic pipes are denoted by thin lines each provided with no pairs of oblique lines along the length thereof.
- the first piston is made up of the booster piston 19 and the input rod 20 , which will be described later, and the first hydraulic chamber 12 A which is formed in the cylinder main body 10 is defined between the second piston 11 and the booster piston 19 (and the input rod 20 ).
- the second hydraulic chamber 12 B is defined between the bottom portion of the cylinder main body 10 and the second piston 11 in the cylinder main body 10 .
- the first return spring 13 is positioned within the first hydraulic chamber 12 A and is disposed between the booster piston 19 and the second piston 11 to thereby bias the booster piston 19 towards the open end of the cylinder main body 10 .
- the second return spring 14 is positioned within the second hydraulic chamber 12 B and is disposed between the bottom portion of the cylinder main body 10 and the second piston 11 to thereby bias the second piston 11 towards the first hydraulic chamber 12 A.
- the cylinder main body 10 of the master cylinder 9 is such that the booster pin 19 (the input rod 20 ) and the second piston 11 are displaced towards the bottom portion of the cylinder main body 10 in response to the depression of the brake pedal 7 to thereby cut off the communication of the first and second supply ports 10 A, 10 B with the interior of the cylinder main body 10 , whereupon a brake hydraulic pressure is produced by a brake fluid present in the first and second hydraulic chambers 12 A, 12 B.
- the booster piston 19 (and the input rod 20 ) and the second piston 11 are displaced in a direction indicated by an arrow B towards the open end of the cylinder main body 10 by the first and second return springs 13 , 14 , whereupon the hydraulic pressures in the first and second hydraulic chambers 12 A, 12 B are relieved while a brake fluid is supplied thereinto from the reservoir 15 .
- the reservoir 15 functioning as a working fluid tank which contains the brake fluid in an interior thereof, is provided in the cylinder main body 10 of the master cylinder 9 .
- the reservoir 15 supplies and discharges the brake fluid into and from the hydraulic chambers 12 A, 12 B in the cylinder main body 10 .
- the brake fluid in the reservoir 15 can be supplied into the hydraulic chambers 12 A, 12 B via the supply ports 10 A, 10 B, respectively and the brake fluid supplied into the hydraulic chambers 12 A, 12 B can be discharged therefrom back into the reservoir 15 via the supply ports 10 A, 10 B.
- the electric booster unit 17 functioning as a booster which boosts the operating force (i.e., the depression force applied to the brake pedal 7 prior to boosted by the booster) or a brake unit, is provided between the brake pedal 7 of the vehicle and the master cylinder 9 .
- This electric booster unit 17 controls to vary a brake hydraulic pressure to be produced in the master cylinder 9 by controlling to drive an electric actuator 21 (of an electric motor 22 ), which will be described later, based on an output from the depression amount detection sensor 8 .
- the electric booster unit 17 includes the booster housing 18 which is fixedly provided on the bulkhead of the body which constitutes a front wall of the passenger compartment, the booster piston 19 which is a piston provided movably in the booster housing 18 and made to move relative to the input rod 20 , which will be described later, and the electric actuator 21 , which will be described later, functioning as an actuator which, reciprocates the booster piston 19 in an axial direction of the master cylinder 9 to impart a booster thrust to the booster piston 19 .
- the booster piston 19 is made up of a cylindrical member which is inserted fittingly in the cylinder main body 10 of the master cylinder 9 so as to slide in the axial direction from the open end of the cylinder body 10 .
- the input rod (the input piston) 20 is fittingly inserted on an inner circumferential side of the booster pin 19 , and this input rod 20 is pushed directly by the brake pedal 7 as the brake pedal 7 is depressed so as to reciprocate in the axial direction of the master cylinder 9 (that is, the directions indicated by the arrows A and B).
- the input rod 20 makes up the first piston of the master cylinder 9 together with the booster pin 19 .
- the brake pedal 7 is connected to a rear (one) end portion of the input rod 20 .
- the first hydraulic chamber 12 A is defined between, the second piston 11 and the booster pin 19 and the input rod 20 .
- the booster housing 18 includes a cylindrical speed reduction machine case 15 A which accommodates a speed reduction mechanism 24 , which will be described later, and the like in an interior thereof, a cylindrical support case 18 B which supports the booster pin 19 which is provided between the speed reduction machine case 18 A and the cylinder main body 10 of the master cylinder 9 so as to be displaced slidably in the axial direction, and a stepped cylindrical lid member 18 C which is disposed on an axially opposite side to the support case 18 B across the speed reduction machine case 18 A (on one axial side) so as to close an opening at one axial side of the speed reduction machine case 18 A.
- a support plate 18 D is provided on an outer circumferential side of the reduction speed machine case 18 A so as to support fixedly the electric motor 22 , which will be described later.
- the input rod 20 is inserted into the booster housing 18 from the lid member 18 C side and extends axially in the booster pin 19 towards the first hydraulic chamber 12 A.
- a pair of neutral springs 20 A, 20 B is interposed between the booster pin 19 and the input rod 20 .
- the booster pin 19 and the input rod 20 are held elastically in a neutral position by means of the spring forces of the neutral springs 20 A, 20 B, so that the spring forces of the neutral springs 20 A, 20 B act on the relative displacement of the booster piston 19 and the input rod 20 .
- a distal end face (a face at the other axial end) of the input rod 20 receives a hydraulic pressure which is produced in the first hydraulic chamber 12 A as a braking reaction force, and the input rod 20 transfers the pressure so received to the brake pedal 7 .
- a proper depression response is given to the driver of the vehicle, who can then feel a good pedal, feeling (depression response).
- the depression feeling of the brake pedal 7 can be improved, and a good pedal feeling (a good, depression, response) can be maintained.
- the input rod 20 is constructed so as to be brought into abutment with the booster piston 19 when it advances a predetermined amount, thereby making it possible to advance the booster piston 19 . This construction enables the booster pin 19 to be advanced by the depressing force applied to the brake pedal 7 to thereby produce a hydraulic pressure in the master cylinder 9 in the event that the electric actuator 21 , which will be descried later, and the first ECU 27 fail.
- the electric actuator 21 of the electric booster unit 17 includes the electric motor 22 which is provided in the speed reduction machine case 18 A of the booster housing 18 via a support plate 18 D, a speed reduction mechanism 24 such as a belt or the like which decelerates the rotation of the electric motor 22 for transmission to the cylindrical rotational member 23 in the speed reduction machine case 18 A, and a direct acting mechanism 25 such as a ball screw or the like which converts a rotation of the cylindrical rotational member 23 to an axial displacement of the booster piston 19 .
- a speed reduction mechanism 24 such as a belt or the like which decelerates the rotation of the electric motor 22 for transmission to the cylindrical rotational member 23 in the speed reduction machine case 18 A
- a direct acting mechanism 25 such as a ball screw or the like which converts a rotation of the cylindrical rotational member 23 to an axial displacement of the booster piston 19 .
- the booster piston 19 of the electric booster unit 17 makes up a pump mechanism which is driven by the electric actuator 21 based on an output (that is, a detection signal) of the depression amount detection sensor 8 to thereby produce a brake hydraulic pressure (a master cylinder pressure) within the master cylinder 9 .
- a return spring 26 is provided in the support case 18 B of the booster housing 18 , and this return spring 26 normally biases the booster piston 19 in a direction in which the brake is released (in the direction indicated by the arrow B in FIGS. 1 and 2 ).
- the brake pedal 7 is released (when the brake is released)
- the electric motor 22 is rotated, in an opposite direction, and the booster piston 19 is returned to its initial position shown in FIG. 2 in the direction indicated by the arrow B by virtue of the biasing force of the return spring 26 .
- the electric motor 22 is made up of a DC brushless motor, for example, and includes a rotation sensor 22 A called a resolver and a current sensor (not shown) which detects a motor current.
- the rotation sensor 22 A detects a rotational position of the electric motor 22 (a rotation angle of a motor shaft of the electric motor) and outputs a detection signal to the control unit of a first control circuit (hereinafter, referred to as the first ECU 27 ).
- the first ECU 27 executes a feedback control based on this rational position detection signal.
- the rotation sensor 22 A also functions a rotation detection unit configured to detect an absolute displacement of the booster piston 19 relative to the body based on the detected rotational position of the electric motor 22 .
- the rotation sensor 22 A makes up a displacement detection unit configured to detect a relative displacement between the booster piston 19 and the input rod 20 together with the depression amount detection sensor 8 and detection signals of these sensors are sent to the first ECU 27 .
- the rotation detection unit is not limited the rotation sensor 22 A such as the resolver, and hence, the rotation detection unit may be made up of a rotational potentiometer which can detect an absolute displacement (angle).
- the speed reduction mechanism 24 is not limited to the belt or the like and hence may be made up of a gear type speed reduction machine.
- the direct acting mechanism 25 which converts a rotation motion into a linear motion can foe made up of, for example, a rack and pinion mechanism or the like.
- the speed reduction machine 24 does not necessarily have to be provided, and for example, a configuration may foe adopted in which a motor shaft is provided integrally on the cylindrical rotational member 23 , anal a stator of the electric motor is disposed on the periphery of the cylindrical rotational member 23 , so that the cylindrical rotational member 23 is rotated directly by the electric motor.
- the first ECU 27 is made up of, for example, a microcomputer and makes up part of the electric booster unit 17 .
- the first ECU 27 makes up a control unit (a friction brake control unit) which configures the friction brake units 6 together with the second ECU 35 , which will be described later.
- the first ECU 27 makes up a first control circuit (an electric booster unit controller) which controls to drive electrically the electric actuator 21 (the electric motor 22 ) of the electric booster unit 17 .
- An input side of the first ECU 27 is connected to the brake switch 7 A which detects whether or not the brake pedal 7 is depressed, the depression amount detection sensor 3 which detects a depression amount of or depression force applied to the brake pedal 7 , the rotation sensor 22 A and the current sensor of the electric motor 22 , an onboard signal line 28 such as one called an L-CAN, for example, which can communicate, a vehicle data bus 29 which transmits and receives signals to and from an ECU for other vehicle devices (for example, a third ECU 54 , which will be described later) and the like.
- the vehicle data bus 29 is an onboard serial communication device called a V-CAN and executes onboard multiplex communications.
- the first ECU 27 is connected with a power supply line 30 and is fed with electric power from a battery 31 (refer to FIG. 1 ) by way of the power supply line 30 .
- a hydraulic pressure sensor 32 as a hydraulic pressure detection device configured to detect a brake hydraulic pressure in the master cylinder 9 detects a hydraulic pressure in the cylinder side hydraulic pipe 16 A, for example, and detects a brake hydraulic pressure which is supplied from the master cylinder 9 to the ESC 33 , which will be described later, by way of the cylinder side hydraulic pipe 16 A.
- the hydraulic pressure sensor 32 is electrically connected to the second ECU 35 , which will be described later, and a detection signal produced by the hydraulic pressure sensor 32 is sent through communication from the second ECU 35 to the first ECU 27 by way of the signal line 28 .
- the hydraulic pressure sensor 32 may be attached directly to the master cylinder 9 , or the detection signal may be inputted directly into the first ECU 27 without involving the second ECU 35 .
- An output side of the first ECU 27 is connected to the electric motor 22 , the onboard signal line 28 , the vehicle data bus 29 and the like.
- the first ECU 27 controls variably a brake hydraulic pressure to be produced in the master cylinder 9 by the use of the electric actuator 21 based on detection signals from the depression amount detection sensor 8 and the hydraulic pressure sensor 32 and also functions to determine whether or not the electric booster unit 17 operates normally.
- the electric booster unit 17 when the brake pedal 7 is depressed, the input rod 20 advances towards the interior of the cylinder main body 10 of the master cylinder 9 , and the movement of the input rod 20 then is detected by the depression amount detection sensor 8 .
- the first ECU 27 outputs an activation command to the electric motor 22 in response to the detection signal from the depression amount detection sensor 8 so as to drive to rotate the electric motor 22 .
- the rotation of the electric motor 22 is transferred to the cylindrical rotational member 23 by way of the speed reduction mechanism 24 , and the rotation of the cylindrical rotational member 23 is converted into an axial displacement of the booster piston 19 by the direct acting mechanism 25 .
- the booster pin 19 advances together with the input rod 20 into the interior of the cylinder main body 10 of the master cylinder 9 , whereby a brake hydraulic pressure which matches the depressing force (thrust) imparted to the input rod 20 by the brake pedal 7 and the booster thrust imparted to the booster piston 19 by the electric actuator 21 is produced in the first and second hydraulic pressure chambers 12 A, 12 B.
- a total braking force required by the vehicle is distributed to a frictional braking force produced by the friction linings of the friction brake units 6 and a regenerative braking force produced by a motor-generator 55 (refer to FIG.
- the booster piston 19 is displaced by the electric actuator 21 so that the brake hydraulic pressure is reduced by an amount corresponding to the regenerative braking force.
- the first ECU 27 can monitor the hydraulic pressure produced in the master cylinder 9 by receiving the detection signal produced by the hydraulic pressure sensor 32 from the signal, line 28 to thereby determine whether or not the electric booster unit 17 operates normally.
- the hydraulic pressure supply unit 33 (that is, the ESC 33 ) will be described which is provided between the wheel cylinders 4 L, 4 R, 5 L, 5 R disposed individually at the wheels (front wheels 2 L, 2 R and the rear wheels 3 L, 3 R) of the vehicle and the master cylinder 9 .
- the ESC 33 makes up a wheel cylinder pressures control unit which controls variably a brake hydraulic pressure produced in the master cylinder 9 (the first and second hydraulic pressure chambers 12 A, 12 B) by the electric booster unit 17 as wheel cylinder pressures at the wheels so as to supply these wheel cylinder pressures individually to the respective wheel cylinders 4 L, 4 R, 5 L, 5 R of the wheels (the front wheels 2 L, 2 R and the rear wheels 3 L, 3 R).
- the ESC 33 supplies required brake hydraulic pressures from, the master cylinder 9 to the wheel cylinders 4 L, 4 R, 5 L, 5 R by way of the cylinder side hydraulic pipes 16 A, 16 B and the like.
- the ESC 33 distributes and supplies hydraulic pressures which are outputted from the master cylinder 9 (the first and second hydraulic pressure chambers 12 A, 12 B) by way of the cylinder side hydraulic pipes 16 A, 16 B to the wheel cylinders 4 L, 4 R, 5 L, 5 R by way of brake side pipes 34 A, 34 B, 34 C, 34 D.
- This imparts individually independent braking forces to the wheels (the front wheels 2 L, 2 R and the rear wheels 5 L, 5 R) as has been described above.
- the ESC 33 includes control valves 40 , 40 ′, 41 , 41 ′, 42 , 42 ′, 45 , 45 ′, 46 , 46 ′, 53 , 53 ′, an electric motor 48 which drives hydraulic pumps 47 , 47 ′, and hydraulic pressure controlling reservoirs 52 , 52 ′.
- the second ECU 35 is made up of, for example, a microcomputer or the like and makes up part of the ESC 33 .
- the second ECU 35 makes up the control unit (the friction brake control unit) which controls the friction brake units 6 together with the first ECU 27 .
- the second ECU 35 makes up a second control circuit (a hydraulic pressure supply unit controller) which electrically controls to drive the ESC 33 .
- An input side of the second ECU 35 is connected to the hydraulic pressure sensor 32 , the signal line 23 , the vehicle data bus 29 , and a slip amount detector 56 , which will foe described later.
- An output side of the second ECU 35 is connected to the control valves 40 , 40 ′, 41 , 41 ′, 42 , 42 ′, 45 , 45 ′, 46 , 46 ′, 53 , 53 ′, the electric motor 43 , the signal line 28 , the vehicle data bus 29 and the like. Additionally, the second ECU 35 is connected to the power supply line 30 and is fed with the electric power from the battery 31 (refer to FIG. 1 ) by way of the power supply line 30 .
- the second ECU 35 controls to drive individually the control valves 40 , 40 ′, 41 , 41 ′, 42 , 42 ′, 45 , 45 ′, 46 , 46 ′, 53 , 53 ′, the electric motor 43 and the like, as will be described later.
- the second ECU 35 controls individually the wheel cylinders 4 L, 4 R, 5 L, 5 R to reduce, hold, increase or pressurize the brake hydraulic pressures which are supplied from the brake side pipes 34 A to 34 D to the wheel cylinders 4 L, 4 R, 5 L, 5 R.
- the ESC 33 includes two hydraulic circuits, that is, a first hydraulic circuit or system 36 and a second hydraulic circuit or system 36 ′.
- the ESC 33 is connected to one of the output ports (that is, the cylinder side hydraulic pipe 16 A) of the master cylinder 9 to supply the hydraulic pressure to the wheel cylinder 4 L of the left front wheel (FL) and the wheel cylinder 5 R at the right rear wheel (RR).
- the ESC 33 is connected to the other output port (that is, the cylinder side hydraulic pipe 16 B) of the master cylinder 9 to supply the hydraulic pressure to the wheel cylinder 4 R at the right front wheel (PR) and the wheel cylinder 5 L at the left rear wheel (RL).
- first hydraulic system 36 and the second hydraulic system 36 ′ have similar configurations, in the following description, only the first hydraulic system 36 will be described. In relation to the second hydraulic system 36 ′, “′” will be added to individual constituent elements and the description thereof will be omitted.
- the first hydraulic system 36 of the ESC 33 has a brake line 37 which is connected to a distal end of the cylinder side hydraulic pipe 16 A.
- the brake line 37 branches into two line portions of a first line portion 33 and a second line portion 39 , which are then connected to the wheel cylinders 4 L, 5 R, respectively.
- the brake line 37 and the first line portion 38 make up together with the brake side pipe 34 A a line which supplies the hydraulic pressure to the wheel cylinder 4 L.
- the brake line 37 and the second line portion 39 make up together with the brake side pipe 34 D a line which supplies the hydraulic pressure to the wheel cylinder 5 R.
- a brake hydraulic pressure supply control valve 40 is provided in the brake line 37 , and this supply control valve 40 is made up of a normally open solenoid selector valve which opens and closes the brake line 37 .
- a hydraulic pressure increase control valve 41 is provided in the first line portion 38 , and this hydraulic pressure increase control valve 41 is made up of a normally open solenoid selector valve which opens and closes the first line portion 38 .
- the hydraulic pressure increase control valve 42 is provided in the second line portion 39 , and this hydraulic pressure increase control valve 42 is made up of a normally open solenoid selector valve which opens and closes the second line portion 39 .
- the first hydraulic circuit 36 of the ESC 33 has first and second hydraulic pressure reduction lines 43 , 44 which connect the hydraulic pressure controlling reservoir 52 to the wheel cylinders 4 L, 5 R, respectively. Then, first and second hydraulic pressure reduction control valves 45 , 46 are provided in the hydraulic pressure reduction lines 43 , 44 , respectively.
- the first and second hydraulic pressure reduction control valves 45 , 46 are made up of normally closed solenoid selector valves which open and close the hydraulic pressure reduction lines 43 , 44 .
- the ESC 33 includes the hydraulic pump 47 as a hydraulic pressure production unit which constitutes a hydraulic pressure source.
- This hydraulic pump 47 is driven to rotate by the electric motor 43 .
- the electric motor 48 is driven by being fed with electric power from the second ECU 35 , and when the supply of electric power is stopped, the electric motor 48 stops rotating together with the hydraulic pump 47 .
- a discharge side of the hydraulic pump 47 is connected to a position along the first line portion 38 which lies downstream of the supply control valve 40 (that is, a position where the brake line 37 branches into the first line portion 38 and the second line portion 39 ) via a check valve 49 .
- a suction side of the hydraulic pump 47 is connected to the hydraulic pressure controlling reservoir 52 via check valves 50 , 51 .
- the hydraulic pressure controlling reservoir 52 is provided to reserve extra brake fluid temporarily and temporarily reserves extra brake fluid which flows out of cylinder chambers (not shown) of the wheel cylinders 4 L, 5 R not only when the brake system (the SSC 33 ) executes the anti-lock braking control but also when the brake system executes the other brake controls. Additionally, the suction side of the hydraulic pump 47 is also connected to the cylinder side hydraulic pipe 16 A of the master cylinder 9 (that is, a position on the brake line 37 which lies upstream of the supply control valve 40 ) via the check valve 50 and the pressurization control valve 53 which is a normally closed solenoid selector valve.
- control valves 40 , 40 ′, 41 , 41 ′, 42 , 42 ′, 45 , 45 ′, 46 , 46 ′, 53 , 53 ′ which make up the ESC 33 and the electric motor 48 which drives the hydraulic pumps 47 , 47 ′ are controlled based on control signals which are outputted from the second ECU 35 .
- the first hydraulic system 36 of the ESC 33 supplies the hydraulic pressure produced in the master cylinder 9 by the electric booster unit 17 directly to the wheel cylinders 4 L, 5 R by way of the brake line 37 and the first and second line portions 38 , 39 .
- the hydraulic pressures in the wheel cylinders 4 L, 5 R are held by closing the hydraulic pressure increase control valves 41 , 42 , and when the hydraulic pressures in the wheel, cylinders 4 L, 5 R are reduced, the hydraulic pressure reduction control valves 45 , 46 are opened to thereby discharge the hydraulic pressures in the wheel cylinders 4 L, 5 R so as to be relieved to the hydraulic pressure controlling reservoir 52 .
- the hydraulic pump 47 is activated to operate by the electric motor 48 with the supply control valve 40 closed, and the brake fluid discharged from the hydraulic pump 47 is supplied to the wheel cylinders 4 L, 5 R via the first and second line portions 38 , 39 .
- the pressurization control valve 53 being opened, the brake fluid in the reservoir 15 is supplied from the master cylinder 9 to the suction side of the hydraulic pump 47 .
- the second ECU 35 controls the operations of the supply control valve, the hydraulic pressure increase control valves 41 , 42 , the hydraulic pressure reduction control valves 45 , 46 , the pressurization control valve 53 and the electric motor 43 (that is, the hydraulic pump 47 ) to thereby hold, reduce or increase the hydraulic pressures to foe supplied to the wheel cylinders 4 L, 5 R.
- the brake controls described above such as the braking force distribution control, the vehicle stabilization control, the brake assisting control, the anti-lock braking control, the traction control, the hill start assisting control and the like are executed.
- the brake hydraulic pressure produced in the first hydraulic pressure chamber 12 A when the first piston (that is, the booster piston 19 and the input rod 20 ) and the second piston 11 of the master cylinder 9 are displaced in the axial direction in the interior of the cylinder main body 10 in response to the depression of the brake pedal 7 with the control valves staying in the states described above is supplied from the cylinder side hydraulic pipe 18 A to the wheel cylinders 4 L, 5 R by way of the first hydraulic system 36 of the ESC 33 and the brake side pipes 34 A, 34 D.
- the brake hydraulic pressure produced in the second hydraulic pressure chamber 12 B is supplied from the cylinder side hydraulic pipe 16 B to the wheel cylinders 4 R, 5 L by way of the second hydraulic system 36 ′ and the brake side pipes 34 B, 34 C.
- the brake hydraulic pressures produced in the first and second hydraulic pressure chambers 12 A, 12 B are detected by the hydraulic pressure sensor 32 which is connected to the second ECO 35 , and an assisting control is executed in which with the detection values used as the depression amount of the brake pedal 7 , the hydraulic pressures in the wheel cylinders 4 L, 5 R are increased so that the wheel cylinder pressures correspond to the detection values.
- the pressurization control valve 53 and the hydraulic pressure increase control valves 41 , 42 are opened, and the supply control valve 40 and the hydraulic pressure reduction control valves 45 , 46 are opened and closed as required.
- the hydraulic pump 47 is activated to operate by the electric motor 48 , and the brake fluid discharged from the hydraulic pump 47 is then supplied to the wheel cylinders 4 L, 5 R by way of the first and second line portions 38 , 39 .
- This enables the wheel cylinders 4 L, 5 R to produce braking forces by the use of the brake fluid discharged from the hydraulic pump 47 based on the brake hydraulic pressure produced, in the master cylinder 9 .
- a known hydraulic pump such as a plunger pump, a trochoid pump, a gear pump or the like
- the gear pump is desirable in consideration of installation in the vehicle, quietness, pump efficiency and the like.
- a known motor such as a DC motor, a DC brushless motor, an AC motor or the like
- the DC motor is used from the viewpoint of installation in the vehicle.
- control, valves 40 , 41 , 42 , 45 , 46 , 53 of the ESC 33 can be set as required according to forms in which they are used, in these control valves, the supply control, valve 40 and the hydraulic pressure increase control valves 41 , 42 are made up ox normally open valves and the hydraulic pressure reduction control valves 45 , 46 and the pressurization control valve 53 are made up of normally closed valves, whereby even in case no control signal is sent from the second ECU 35 , the hydraulic pressure can be supplied from the master cylinder 9 to the wheel cylinders 4 L to 5 R. Consequently, from the viewpoint of fail-safe of the brake system and control efficiency, it is desirable to adopt the configuration described above.
- the third ECU 54 is connected to the vehicle data bus 29 which is installed in the vehicle, and this third ECU 54 functions as a third control circuit (an electric power charging controller, a regeneration cooperative control unit) which controls electrically the driving of the motor-generator 55 (refer to FIG. 1 ), which will foe described later.
- the third ECU 54 is made up of a microcomputer or the like and includes, for example, a motor-generator controller (a control unit) which controls the driving conditions (power running, regeneration) of the motor-generator 55 .
- the third ECU 54 is such that a braking force is obtained while recovering (regenerating) kinetic energy as electric power by controlling the motor-generator 55 which is the drive motor (the electric motor) of the vehicle by making use of the inertial force produced by the rotation of the wheels (in this embodiment, the front wheels 2 L, 2 R) when slowing or braking the vehicle.
- the third ECU 54 is connected to the first and second ECUs 27 , 35 by way of the vehicle data bus 29 to make up a control unit for controlling the amount of regenerative braking (a regenerative braking control unit).
- the third ECU 54 is connected to the power supply line 30 and is fed with electric power from the battery 31 (refer to FIG. 1 ) through the power supply line 30 .
- the motor-generator (M-G) 55 which is a regeneration control unit connected to the third ECU 54 is configured as an electric motor (a generating motor) which drives the vehicle for acceleration when the vehicle is attempted to be accelerated and which generates (regenerates) electric power based on the inertial force of the vehicle when the vehicle is decelerated.
- the motor-generator 55 functions, for example, as a motor (an electric motor) which generates torque (a rotational force) to drive the vehicle based on electric power stored in a battery unit (not shown) of the vehicle and as a generator (a generator) which generates electric power based on the running inertial force of the vehicle.
- a motor an electric motor
- a generator a generator
- the motor-generator 55 is shown as the drive source of the vehicle, for example, in case the vehicle is an electric vehicle, the motor-generator 55 constitutes a drive source for driving the vehicle, while in case the vehicle is a hybrid electric vehicle, the motor-generator 55 and an engine (an internal combustion engine), not shown, constitute a drive source for driving the vehicle.
- the regeneration cooperative control means a brake control in which, when slowing or braking the vehicle, a total braking force desired for the vehicle is obtained by both of (i) recovering (regenerating) the kinetic energy as electric power by rotating the motor-generator 55 based on the inertial force of the vehicle, and (ii) adjusting the braking force by the friction linings of the friction brake units 6 (frictional braking force) by subtracting the regenerative braking force produced by regeneration, of the motor-generator 55 (a regenerative braking force) from the depression amount of the brake pedal by the driver.
- a maximum value of regenerative braking which is produced by the regeneration cooperative control is regulated by an amount of hydraulic pressure which can be reduced realistically in the master cylinder 9 by changing the control amount of the electric motor 22 of the electric booster unit 17 . Because of this, a required amount of regenerative braking is transmitted from the first ECU 27 which controls the electric motor 22 to the third ECU 54 which controls the motor-generator 55 by way of the vehicle data bus 29 . Although this required amount of regenerative braking is regulated in the first ECU 27 , since it is the third ECU 54 that causes the motor-generator 55 to produce a regenerative braking force, there is a possibility that the required amount of regenerative braking differs from an actual amount of regenerative braking.
- the total amount of braking becomes small which is a combination of an amount of fractional braking based on hydraulic pressure and an amount of regenerative braking executed by the motor-generator 55 . Because of this, there are fears that the deceleration is lost or reduced. In order to restrict the occurrence of deceleration loss or reduction, an amount of regenerative braking which is actually produced is transmitted as an amount of regenerative braking which is actually executed from the third ECU 54 to the first ECU 27 through the vehicle data bus 29 .
- the first ECU 27 regulates, based on the amount of regenerative braking which is actually executed so received, the amount of hydraulic pressure to be reduced in the master cylinder 9 corresponding to the amount of regenerative braking which is actually executed, drives the electrical motor 22 in order to produce the amount of friction braking after addition of the amount of hydraulic pressure to foe reduced, and produces a desired, braking force calculated based on the amount of brake operating amount by the driver.
- the amount of regenerative braking which is actually executed should never fail to be equal to or larger than the required, amount of regenerative braking.
- the following driving scene may occur in a vehicle in which the regeneration cooperative control is executed. Namely, when the driver depresses the brake pedal 7 while driving the vehicle, activating the regeneration cooperative control to operate, since the amount of frictional braking is reduced by the amount corresponding to the amount of regenerative braking as described above, the total amount of braking applied, on the drive wheels (in the case of this embodiment, the front wheels 2 L, 2 R) becomes larger than when the regeneration cooperative control is not executed. As this occurs, in case the total amount of braking applied on the drive wheels is larger than a limit slip amount, there are fears that the drive wheels slip when the vehicle is turning. As this occurs, an oversteer (or understeer) condition occurs, resulting in an unstable behavior of the vehicle.
- the total amount of braking applied on the drive wheels becomes large, which causes the drive wheels to slip, leading to fears that the so-called early intervention of the anti-lock braking control is caused in which the anti-lock braking control by the ESC 33 is started earlier than when the regeneration cooperative control is not executed.
- the slip amount for slip ratio) of the front wheels 2 L, 2 R which constitute the drive wheels is detected, and in case the total amount of braking applied on the drive wheels (the front wheels 21 , 2 R) is larger than the slip limit amount, the total amount of braking applied on the drive wheels (the front wheels 2 L, 2 R) is made small toy reducing largely the amount of regenerative braking in an initial stage of slip, so as to realize the restriction of change in behavior of the vehicle and early intervention of the anti-lock braking control.
- the slip amount detector 56 is connected to the second ECU 35 , and this slip amount detector 56 is configured to detect slip amounts (or slip ratios) of the wheels 2 L, 2 R, 3 L, 3 R which are fitted on the vehicle.
- the slip amount detector 56 can be made up of, for example, wheel speed sensors which detects rotational speeds of the corresponding wheels 2 L, 2 R, 3 L, 3 R. As this occurs, a slip amount of the front wheels 2 L, 2 R which constitute the drive wheels can be calculated based on a difference in rotational speed between the front wheels 2 L, 2 R which constitute the drive wheels and the rear wheels 3 L, 3 R which constitute driven wheels. Additionally, the slip amount detector 56 can also be made up of the wheel speed sensors which detect the rotational speeds of the front wheels 2 L, 2 R which constitute the drive wheels and a vehicle speed sensor which detects a rotational speed of a rotational shape of a transmission.
- a slip amount of the front wheels 2 L, 2 R which constitute the drive wheels can be calculated based on a difference between the wheel speeds detected by the wheel speed sensors and the vehicle speed (the body speed, the vehicle speed) which is detected by the vehicle speed sensor.
- the slip amount detector 56 and the second ECU 35 of the SSC 33 are shown separately, the slip amount detecting function may be incorporated in the second ECU 35 .
- the wheel speed sensors which detects the rotational speeds of the wheels 2 L, 2 R, 3 L, 3 R are connected to the second ECU 35 .
- the first ECU 27 has a regenerative slip control unit (operations in a step 3 and a step 6 in FIG. 3 , which will be described later) which reduces the amount of regenerative braking by the motor-generator 55 when the wheels (specifically speaking, the front wheels 2 L, 2 R which constitute the drive wheels) are detected as slipping based on the detection value of the slip amount detector 56 which the regenerative slip control unit receives via the second ECU 35 and the vehicle data, bus 25 during the regenerative braking by the motor-generator 55 .
- a regenerative slip control unit (operations in a step 3 and a step 6 in FIG. 3 , which will be described later) which reduces the amount of regenerative braking by the motor-generator 55 when the wheels (specifically speaking, the front wheels 2 L, 2 R which constitute the drive wheels) are detected as slipping based on the detection value of the slip amount detector 56 which the regenerative slip control unit receives via the second ECU 35 and the vehicle data, bus 25 during
- This regenerative slip control unit executes repeatedly a slip restricting control in which, the amount of regenerative braking by the motor-generator 55 is reduced by a predetermined amount and thereafter, the resulting reduced amount of regenerative braking is held for a predetermined period of time while the front wheels 21 , 22 which constitute the drive wheel are being detected as slipping based on the detection value of the slip amount detector 56 during the regenerative braking by the motor-generator 55 .
- the regenerative slip control unit reduces the amount of regenerative braking by the motor-generator 55 when the slip amount of the drive wheels equals or exceeds a slip threshold to thereby reduce the amount of braking applied on the drive wheels step by step.
- the reduction amount of regenerative braking is set so that the initial (for example, the first) reduction amount is larger than the subsequent (for example, the second) reduction amount.
- the brake control system according to this embodiment is configured in the way described heretofore, and the operation thereof will be described next.
- the input rod 20 is pushed in a direction indicated by an arrow A, and a detection signal is inputted from the depression amount detection sensor 8 into the first ECU 27 .
- the first ECU 27 controls the operation of the electric actuator 21 of the electric booster unit 17 according to a detection value signaled by the detection signal. Namely, the first ECU 27 feeds the electric motor 22 based on the detection signal from the depression amount detection sensor 8 so as to control to drive the electric motor 22 .
- the first ECU 27 calculates a braking force (a frictional braking force) to be produced at each of the friction brake units 6 which results from subtracting a braking force (a regenerative braking force) produced by the motor-generator 55 from a braking force (a total braking force required by the vehicle) according to the driver's intention which corresponds to the stroke amount of the brake pedal 7 and feeds the electric motor 22 to control and drive the electric motor 22 so that a hydraulic pressure is produced to obtain the braking force calculated.
- a braking force a frictional braking force
- the rotation of the electric motor 22 is transferred to the cylindrical rotational member 23 via the speed reduction mechanism 24 , and the rotation of the cylindrical rotational member is converted into an axial displacement of the booster piston 19 by the direct acting mechanism 25 .
- This displaces the booster piston 19 of the electric booster unit 17 in an advancing direction towards the interior of the cylinder main body 10 of the master cylinder 9 , whereby brake hydraulic pressures according to the depressing force (thrust) which is imparted from the brake pedal 7 to the input rod 20 and the booster thrust imparted from the electric actuator 21 to the booster piston 19 are produced in the first and second hydraulic pressure chambers 12 A, 12 B.
- the ESC 33 which is provided between the wheel cylinders 4 L, 4 R, 5 L, 5 R in the wheels (the front wheels 2 L, 2 R and the rear wheels 3 L, 3 R) and the master cylinder 9 distributes to supply the hydraulic pressure produced by the electric booster unit 17 in the master cylinder 9 (the first and second hydraulic pressure chambers 12 A, 12 B) as a master cylinder pressure to the wheel cylinders 4 L, 4 R, 5 L, 5 R as wheel cylinder pressures at the individual wheels from the cylinder side hydraulic pipes 16 A, 16 B by way of the hydraulic systems 36 , 36 ′ in the ESC 33 and the brake side pipe portions 34 A, 34 B, 34 C, 34 D while variably controlling the hydraulic pressure or the master cylinder pressure.
- This allows a proper braking force to foe imparted to the individual wheels (the front wheels 21 , 2 R and the rear wheels 3 L, 3 R) of the vehicle via the corresponding wheel cylinders 41 , 4 R, 5 L, 5 R.
- the second ECU 35 which controls the SSC 33 feeds the electric motor 48 based on the detection, signal from the depression amount detection sensor 8 which the second ECU 35 receives through the signal line 28 to thereby activate the hydraulic pumps 47 , 47 ′ to operate, selectively opening or closing the individual control valves 40 , 40 ′, 41 , 41 ′, 42 , 42 ′, 45 , 45 ′, 46 , 46 ′, 53 , 53 ′.
- This can execute the braking force distributing control, the anti-look braking control, the vehicle stabilizing control, the hill start assisting control, the traction control, the vehicle following control, the lane departing avoidance control, the obstacle avoidance control and the like.
- the second ECU 35 selectively opens or closes the individual control valves 40 , 40 ′, 41 , 41 ′, 42 , 42 ′, 45 , 45 ′, 46 , 46 ′, 53 , 53 ′ to reduce, hold or increase the brake hydraulic pressures in the wheel cylinders 4 L, 4 R, 5 L, 5 R, whereby the slipping (locking) of the wheels 2 L, 2 R, 3 L, 3 R is restricted.
- the relative slip ratio is calculated from the body speed and the wheel speeds so as to control the magnitude of regenerative braking according to the slip ratio so calculated.
- a regenerative braking area is increased, that is, an increase gradient of the amount of regenerative braking is made steep in order to realize an extension in mileage based on electric power, for example, by increasing regenerative electric power based on regenerative braking.
- the increase gradient is made steep, a change rate of the amount of braking produced at the drive wheels becomes large, leading to fears that a time of excessive braking force condition in which the braking forces at the drive wheels are larger than the slip limit is extended.
- the amount of regenerative braking is reduced so as to reduce the amount of braking applied on the drive wheels.
- the reduction amount of regenerative braking when the drive wheels are detected as slipping is set larger than the subsequent reduction amount of regenerative braking, whereby even when a slip occurs, the behavior of the vehicle can be maintained, stable.
- the process shown in FIG. 3 is executed repeatedly at intervals of a predetermined controlling time by the first ECU 27 while the first ECU 27 is kept energized.
- the first ECU 27 calculates a slip amount of the front wheels 2 L, 2 R which constitute the drive wheels.
- This slip amount is calculated based on the detection value of the slip amount detector 56 .
- the slip amount detector 56 is made up of the wheel, speed sensors which detect the rotational speeds of the wheels 2 L, 2 R, 3 L, 3 R, the slip amount of the front wheels 2 L, 2 R which constitute the drive wheels can be calculated based on a difference in rotational speed between the front wheels 2 L, 2 R which constitute the drive wheels and the rear wheels 3 L, 3 R which constitute the driven wheels.
- the slip amount can also be calculated based on a difference between the wheel speeds detected by the wheel speed sensors and the vehicle speed (the body speed, the vehicle speed) detected by the vehicle speed sensor.
- step 2 it is determined whether or not the slip amount calculated in step 1 is equal to or larger than the slip threshold.
- the slip threshold constitutes a determination value based on which whether or not the amount of braking applied on the drive wheels (the front wheels 2 L, 2 R) needs to be reduced (largely) is determined.
- the value of the slip threshold is set in advance based on experiments, calculations, simulations or the like so that the amount of regenerative braking can foe reduced so appropriately to maintain the behavior of the vehicle stable.
- step 2 If “YES” in step 2 , that is, if it is determined, in step 2 that the slip amount is equal to or larger than the slip threshold, the slip amount is large, and hence, it is highly possible that the behavior of the vehicle is deteriorated or that the anti-lock braking control is expected to intervene too early. In this case, the process proceeds to step 3 , where the amount of regenerative braking (regenerative torque) of the drive wheels (the front wheels 2 L, 2 R) is reduced largely.
- regenerative braking regenerative torque
- step 2 the amount of braking on the drive wheels needs to be made smaller than the slip limit amount as soon as possible since when determined, as “YES” in step 2 , as the increase gradient of the amount of regenerative braking gets steeper, the amount of braking on the drive wheels becomes larger than the slip limit amount due to the regenerative cooperation is executed as shown in FIGS. 4 and 5 .
- the difference between the slip limit amount and the amount of braking on the drive wheels becomes larger as the time until the detection of the slip amount becomes longer.
- the slip amount increases, and it is highly possible that the increase in slip amount leads to the deterioration of the behavior of the vehicle or the early intervention of the anti-lock braking control. Because of this, if it is determined that the slip amount is equal to or larger than the slip threshold, the amount of regenerative braking is reduced as much as possible, whereby the amount of braking on the drive wheels is made small as soon as possible so as to restrict the deterioration of the behavior of the vehicle or the early intervention of the anti-lock braking control.
- step 3 the value of the extent by which the amount of regenerative braking is reduced in step 3 , that is, the “large reduction in the amount of regenerative braking” or the first reduction amount is set in advance to, for example, such a value that can lower sufficiently the slip threshold by a single reduction based experiments, calculations, simulations or the like.
- step 3 the amount of regenerative braking (regenerative torque) at the drive wheels (the front wheels 2 L, 2 R) is reduced largely, whereafter the process returns to the start via a step of return, and the operations from step 1 on are repeated.
- step 2 if “PO” in step 2 , that is, if it is determined in step 2 that the slip amount is smaller than the slip threshold, the slip amount is small, and it is considered that there is a low possibility that the slip amount leads to the deterioration of the behavior of the vehicle or the early intervention of the anti-lock braking control.
- the slip amount is smaller than the slip threshold, it is possible that the slip amount is not sufficiently low.
- the amount of regenerative braking regenerative torque
- step 4 it is determined whether or not the slip amount is equal to or larger than a target slip amount which corresponds to a sufficiently low value (a target value).
- the target slip amount is used as a value for determining whether or not the slip amount is a sufficiently low value is determined, more specifically, a value for determining whether or not the amount of braking applied on the drive wheels (the front wheels 2 L, 2 R) needs to be reduced by a small amount is determined.
- the slip amount is set in advance to such a value that can reduce the amount of regenerative braking as required so as to maintain the behavior of the vehicle stable based upon experiments, calculations, simulations or the like.
- step 4 determines “NO” in step 4 , that is, if it is determined in step 4 that the slip amount is smaller than the target slip amount, since the slip amount is sufficiently low (the slip amount is zero or small), the process returns to the start via the step of return without-involving operations in steps 5 , 6 , and the operations from step 1 on are repeated. Namely, in case it is determined “NO” in step 4 , the operation to reduce the amount of regenerative braking (regenerative torque) is not executed (the normal regeneration cooperative control is continued).
- step 4 determines “YES” in step 4 , that is, if it is determined in step 4 that the slip amount is equal to or larger than the target slip amount
- the process proceeds to step 5 , where it is determined whether or not a certain period of time has elapsed since the operation to reduce the amount of regenerative braking (regenerative torque) which was executed before the present control cycle. Namely, it is determined whether or not a certain period of time has elapsed since the amount of regenerative braking was last reduced. This ensures the intervals of a certain period, of time at which the amount of regenerative braking is reduced, whereby the amount of regenerative braking is held for the certain period of time.
- step 5 it is determined in step 5 whether or not the certain period of time has elapsed since the reduction in regenerative torque so that after the amount of regenerative braking is reduced, the reduced amount of regenerative braking can be held.
- the certain period of time is set in advance to such a value that can restrict the occurrence of lack of braking force (the deterioration of the behavior of the vehicle, the loss of deceleration) based on experiments, calculations, simulations or the like.
- step 5 If it is determined “NO” in step 5 , that is, it is determined in step 5 that the certain period of time has not elapsed since the previous reduction in the amount of regenerative braking (regenerative torque), the process returns to the start via the step of return without involving an operation in step 6 with the current amount of regenerative braking held, and the operations from, step 1 on are repeated. On the other hand, if it is determined “YES” in step 5 , that is, if it is determined in step 5 that the certain period of time has elapsed since the previous reduction in the amount of regenerative braking (regenerative torque), the process proceeds to step 6 .
- step 6 the amount of regenerative braking (regenerative torque) of the drive wheels (the front wheels 2 L, 2 R) is reduced by a smaller amount than the amount of reduction used in the operation in step 3 , that is, a second reduction amount.
- the reason that the amount of regenerative braking is reduced small in this way is that as described above, in case the amount by which the amount of regenerative braking is reduced is large, there is caused lack of braking force depending upon the response to the rise in hydraulic pressure in the master cylinder 9 , leading to fears that the deceleration is reduced.
- step 6 since the slip amount is smaller than, the slip threshold, the amount of regenerative braking (regenerative torque) is reduced small, so that the lack of braking force (the reduction in deceleration) caused in association with the response is restricted.
- step 6 the value of the extent by which the amount of regenerative braking is reduced, that is, the “small reduction in the amount of regenerative braking” is set in advance to, for example, such a value that can restrict, the lack of braking force (the reduction in deceleration) associated with the response based on experiments, calculations, simulations or the like.
- the amount of regenerative braking (regenerative torque) of the drive wheels (the front wheels 21 , 2 R) is reduced small, in step 6 , the process returns to the start via the step of return, and the operations from step 1 on are repeated.
- the first ECU 27 transmits the required amount of regenerative braking which is reduced based on the operation in step 3 in FIG. 3 to the third ECU 54 by way of the vehicle data bus 29 .
- the third ECU 54 reduces the amount of regenerative braking at the drive wheels and transmits the reduced amount of regenerative braking (the amount of regenerative braking which is actually executed) to the first ECU 27 by way of the vehicle data bus 29 .
- the first ECU 27 produces a difference between the received amount of regenerate braking which is actually executed and a total amount of braking which is to be produced toy the driver depressing the brake pedal 7 , as an amount of friction braking required at the friction brake units 6 , by changing the electric motor 22 of the electric booster unit 17 to increase the hydraulic pressure in the master cylinder 9 .
- the behavior of the vehicle can be maintained stable when a slip is generated.
- the ECO 27 reduces the amount of regenerative braking by the operation in step 3 .
- the amount of regenerative braking which is reduced by the operation in step 3 is set larger than the predetermined reduction amount by which the subsequent regenerative braking is reduced, that is, the predetermined reduction amount by which the regenerative braking is reduced by the operation in step 6 .
- This setting can make large the predetermined reduction amount in the initial (first) regenerative braking executed when the slip occurs, thereby making it possible to restrict the continuation of the state in which the amount of braking is excessive (to shorten the time when the state continues in which the amount of braking is excessive). As a result of this, it is possible to maintain the behavior of the vehicle stable when the wheels slip.
- FIGS. 3 and 5 show changes with time in the amount of braking applied on the drive wheels and the amount of slip of the drive wheels.
- FIG. 4 shows an example in which the operation in step 6 to reduce the amount of regenerative braking is repeated, three times after the operation in step 3 to reduce the amount of regenerative braking is executed.
- the amount of braking applied on the drive wheels is lowered below the slip limit amount by the operation in step 3 to reduce the amount of regenerative braking, and thereafter, the operation in step 6 to reduce the amount of regenerative braking is repeated three times until the slip amount of the drive wheels is lowered below the target slip amount.
- FIG. 4 shows an example in which the operation in step 6 to reduce the amount of regenerative braking is repeated, three times after the operation in step 3 to reduce the amount of regenerative braking is executed.
- the amount of braking applied on the drive wheels is lowered below the slip limit amount by the operation in step 3 to reduce the amount of regenerative braking, and thereafter, the operation in step 6 to reduce the amount
- step 5 shows an example in which the operation in step 6 to reduce the amount of regenerative braking is executed once after the operation in step 3 to reduce the amount of regenerative braking is executed.
- the operation in step 6 to reduce the amount of regenerative braking is executed once after the operation in step 3 to reduce the amount of regenerative braking is executed, whereby the slip amount of the drive wheels is lowered below the target slip amount.
- steps 2 , 3 , 5 and 6 in FIG. 3 show specific examples of the regenerative slip control unit which constitutes one of the constituent features of the invention.
- intervals at which the amount of regenerative braking is reduced are described as being constant.
- the invention is not limited thereto, and hence, as with a first modified example shown in FIG. 6 , intervals t 1 , t 2 at which the slip restricting control is executed (the amount of regenerative braking is reduced) may be varied (t 1 ⁇ t 2 ).
- the intervals at which the slip restricting control is executed are made small, that is, t 1 ⁇ t 2 , whereby the (total) reduction amount of regenerative braking in the initial stage of occurrence of slip can be made large.
- the intervals at which, the slip restricting control is executed can be extended every time he slip restricting control is repeated. In this respect, too, it is possible to maintain the behavior of the vehicle stable when the wheels slip.
- the predetermined reduction amount by which the amount of regenerative braking is reduced is described as being constant (the predetermined reduction amount in step 6 is constant).
- the invention is not limited thereto.
- predetermined reduction amounts a, b, c, d, e, f may be reduced (a>b>c>d>e>f) every time the slip restricting control is repeated.
- the second modified example may be carried out in combination with the first modified example.
- control process shown in FIG. 3 is described as being executed by the first ECU 27 .
- the invention is not limited thereto.
- a configuration may be adopted in which the control process shown, in FIG. 3 is executed, by the third ECU 54 or the second ECU 35 .
- the control process may be executed by anyone of the other ECUs disposed in the vehicle.
- the slip amount detector 56 which is the slip amount detecting unit is described as being connected to the second ECU 35 .
- the invention is not limited thereto, and hence, a configuration may be adopted in which the slip amount detector 56 is connected to, for example, the first ECO 27 or the third ECU 54 .
- the slip amount detector 56 may be connected, to anyone of the other ECUs disposed in the vehicle.
- the front wheels 22 , 2 R are described, as being driven, by the motor-generator 55 which is the traction, (drive) motor.
- the drive wheels are described as being the front wheels 2 L, 2 R.
- the motor-generator (the electric motor) may drive the rear wheels (the drive wheels are the rear wheels).
- the motor-generator may drive both the front wheels and the rear wheels (the drive wheels are the front and rear wheels).
- the behavior of the vehicle can be maintained stable when the wheels slip.
- the regenerative slip control unit sets the predetermined reduction amount of regenerative braking when the wheels slip larger than the predetermined reduction amount of regenerative braking in the subsequent slip restricting control.
- This setting can make large the initial (first) predetermined reduction amount of regenerative braking when the wheels slip, thereby making it possible to restrict the continuation of the state in which the amount of braking is excessive (to shorten the time when the amount of braking is excessive). As a result of this, the behavior of the vehicle can be maintained stable when the wheels slip.
- the regenerative slip control unit varies the intervals at which the slip restricting control is executed.
- the intervals at which the slip restricting control is executed is made small (the intervals at which the slip restricting control is executed is extended every time the slip restricting control is repeated) as the time which elapses since the occurrence of slip becomes short, whereby the (total) reduction amount of regenerative braking in the initial stage of occurrence of slip can be made large. In this respect, too, this can maintain stable the behavior of the vehicle when the wheels slip.
- the regenerative slip control unit reduces the predetermined reduction amount every time the slip restricting control is repeated.
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JP2014017779A JP6219186B2 (ja) | 2014-01-31 | 2014-01-31 | ブレーキ制御装置 |
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JP (1) | JP6219186B2 (ko) |
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US20150217741A1 (en) | 2015-08-06 |
KR102187995B1 (ko) | 2020-12-07 |
DE102015201530A1 (de) | 2015-08-06 |
CN104816716A (zh) | 2015-08-05 |
JP6219186B2 (ja) | 2017-10-25 |
KR20150091244A (ko) | 2015-08-10 |
JP2015146657A (ja) | 2015-08-13 |
CN104816716B (zh) | 2018-12-14 |
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